<template>
    <el-breadcrumb class="app-breadcrumb" separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }"><svg-icon class="bread-icon" icon-class="home"/></el-breadcrumb-item>
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
                <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script>
    import pathToRegexp from 'path-to-regexp'

    export default {
        data () {
            return {
                levelList: null
            }
        },
        watch: {
            $route (route) {
                // if you go to the redirect page, do not update the breadcrumbs
                if (route.path.startsWith('/redirect/')) {
                    return
                }
                this.getBreadcrumb()
            }
        },
        created () {
            this.getBreadcrumb()
        },
        methods: {
            getBreadcrumb () {
                // only show routes with meta.title
                let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
                // const first = matched[0]

                // if (!this.isDashboard(first)) {
                //     // path: '/dashboard' to '/' 避免dashboard有子级时重复添加
                //     matched = [{path: '/', meta: {title: 'DRG支付管理系统'}}].concat(matched)
                // }

                this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
            },
            isDashboard (route) {
                const name = route && route.name
                if (!name) {
                    return false
                }
                return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
            },
            pathCompile (path) {
                // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
                const {params} = this.$route
                let toPath = pathToRegexp.compile(path)
                return toPath(params)
            },
            handleLink (item) {
                const {redirect, path} = item
                if (redirect) {
                    this.$router.push(redirect)
                    return
                }
                this.$router.push(this.pathCompile(path))
            }
        }
    }
</script>

<style lang="scss" scoped>
    .app-breadcrumb.el-breadcrumb {
        display: inline-block;
        font-size: 14px;
        line-height: 30px;
        margin-left: 8px;

        .no-redirect {
            color: #97a8be;
            cursor: text;
        }
    }
    .bread-icon {
        color: #303133;
    }
</style>
